SA519401094B1 - Methods and Systems for Neutralizing Hydrogen Sulfide During Drilling - Google Patents

Abstract

A method to neutralize hydrogen sulfide in a wellbore during drilling operations is provided. The method comprising the steps of mixing an amount of scavenger into a drilling mud to produce a scavenger-containing drilling mud such that the scavenger-containing drilling mud has a scavenging capacity, wherein the drilling mud is at a target pH, and introducing the scavenger-containing drilling mud into the wellbore during drilling operations, where the scavenger-containing drilling mud is operable to work with a drill bit to drill the wellbore, where the amount of scavenger in the scavenger-containing drilling mud is operable to irreversibly react with hydrogen sulfide present in the drilling mud to produce a scavenged hydrogen sulfide. Fig 1.

Description

Methods and Systems for Neutralizing Hydrogen Sulfide During Drilling FULL DESCRIPTION BACKGROUND The present invention relates specifically to methods and systems for Neutralizing Hydrogen Sulfide During Drilling; The present invention relates to methods and systems for the removal of hydrogen sulfide and the monitoring of hydrogen sulfide in fluids. During drilling in a formation with a high amount of hydrogen sulfide (H28) “for example, an environment with high hydrogen sulfide; Hydrogen sulphide can be released at the surface causing problems for the surrounding environment and interrupting the drilling process. in addition to; The release of hydrogen sulfide can negatively affect safety and performance. Existing removal of hydrogen sulfide methods fail to monitor or control 0 concentration of hydrogen sulfide compounds, which poses the risk of adding too few hydrogen sulfide compounds thereby allowing the release of hydrogen sulfide. in addition to; Many of the current hydrogen sulfide scavengers can harm the environment due to the presence of harmful components such as zinc. 5 Scavengers (AT) can precipitate residual hydrogen sulfide that can damage formation; such as those containing iron compounds. US Order 2014128294 relates to corrosion ale system for low, medium or high temperature applications Jie Geothermal applications, oilfield applications, power plant applications, or other low, medium, or high temperature applications where scale and corrosion are problems and methods of manufacture and use. Drilling fluid Drilling samples.

GENERAL DESCRIPTION OF THE INVENTION The present invention relates to methods and systems for the removal of hydrogen sulfide. on dag select; The present invention relates to methods and systems for removal of hydrogen sulfide and monitoring of hydrogen sulfide in fluids.

In the first aspect of the invention; A method for neutralizing hydrogen sulfide in hole i during drilling operations is presented. The method includes the steps of mixing a quantity of scavenger into a drilling mud to produce a scavenging drilling mud such that the scavenger-containing drilling mud has scavenging ability; where the drilling mud is at a target pH; and inserting drilling mud containing a sweeper into a hole

0 Blisters during drilling operations where the scavenger-containing drilling mud is operable to act with a drill bit to drill an oll hole where the scavenger-containing drilling mud is operable to react irreversibly with the hydrogen sulfide present in the drilling mud To produce hydrogen sulfide was scavenged. in certain aspects; The method also includes the step of adding a pH buffer solution to a slurry

5 1 Drilling Before the step of mixing an amount of scavenger into the drilling mud so that the target pH of the scavenger-containing drilling mud is in the range of 10.5 to 11. in certain aspects; The scavenging volume is in excess of 11.38 kg/m3 (4 lb/barrel). in certain aspects; The scavenging capacity ranges from 800 mg/l to 1 200 mg/l. In (DRA) aspects the method also includes the steps of monitoring the pH of the scavenger-containing slurry and adding a pH buffer solution

0 pH is added to scavenger-containing slurries to maintain the target pH between 10.5 and 11. in certain aspects; The pH is monitored every 30 minutes. In aspects (dre) the pH is monitored using a 0. Pen Type monitor in certain aspects; the scavenging is Ble for triazine. In certain aspects; the method also includes monitoring the scavenging capacity of the slurry

containing scavenger; And add an extra amount of sweep if the sweep capacity is less than the depleted sweep level. In a second aspect of the invention, a method was presented for the neutralization of hydrogen sulfide in polluted mud at a surface during drilling operations. The method involves the steps of introducing the contaminated slurry into a processing loop; The contaminated slurry comes out of a well bore before being fed into the treatment loop. The treatment loop includes an injection point for a pH-regulating solution; The pH buffer injection point is configured to inject a pH buffer solution into the contaminated slurry to produce a high pH slurry at a target pH; sample point The sample point is set to measure the pH of a high pH slurry; and sweeping injection point; The scavenger injection point is configured to inject an amount of scavenger. The method also includes the step of injecting a pH buffer into the contaminated slurry at the point of buffer injection to produce a high pH slurry; measure the pH of the sample point; injecting an amount of scavenger into the high pH slurry to produce a cured slurry; and enter the treated slurry into the elie tank the stirred tank is prepared to rotate the treated slurry for a certain processing time to produce clean slurry; and introduce clean mud into the reservoir of the Obs platform 5 the tank of the Lge drilling rig is to supply the clean mud to the hole al in certain sides; The scavenging volume is in excess of 11.38 kg/m3 (4 lb/barrel). in certain aspects; The scavenging capacity ranges from 800 mg/L to 1200 mg/L. In the dime sides the agitated tank includes an agitator” the agitating sal is fitted to create turbulence in the agitated tank; A circulation pump is equipped to withdraw part of the treated slurry and return the withdrawn part to the stirred tank. 0 in certain aspects; The sample point includes a pH monitor. in certain aspects; The scavenger is triazine. In cline aspects the method also includes monitoring of scavenging capacity in the treated slurry; Add additional scavenger at the scavenging injection point if the scavenging capacity is less than a depleted scavenging level. Brief description of the drawings

These and other features, aspects, and advantages of the present invention will be better described by gdh in the following descriptions, claims, and accompanying drawings. should be noted; However; The drawing boards illustrate only certain embodiments of the invention and therefore should not be considered as limiting the scope of the invention as they may be accepted for other equivalent effective embodiments. Figure 1 is a schematic diagram of a system according to one of the embodiments of the invention.

Figure 2 is a schematic diagram of a system according to one of the embodiments of the invention. Detailed Description: Although the invention will be described by several embodiments; However, it is understood that the person with experience in related art will appreciate many examples, changes and modifications to the device

0 and the methods described herein are within the scope and spirit of the invention. Accordingly » representative embodiments of the invention described herein are provided without any loss of generality Gedy imposes limitations on the claimed invention. (Buia) The present invention provides methods and systems for removing hydrogen sulfide from a drilling mud without having to send the hydrogen sulfide gas that comes out of the blisters at the surface to a flare. The methods and systems of the present invention are equivalent to sulfide

5 hydrogen from the well. Hydrogen sulfide can be released from the formation into the well. The hydrogen sulfide that is released from the blister can mix with the drilling mud that can be returned from the wellbore. As used herein, the term 'drilling mud' refers to any drilling fluid suitable for use in the drilling of a blister hole. Drilling mud can be a water-based drilling mud. in spite of

There are other terms used to describe drilling mud in the presence of sulfides, pH buffer or scavenger, but it should be understood that the "basic" drilling mud remains the same with the added components.

As used herein the term ial operations 7 refers to the use of a drill and a drill bit to drill a hole J in a formation. Drilling operations use includes all types of formations, rigs, drilling rigs and operations where hydrogen sulfide can be present in the reflux mud from the digger.

As used here the term scavenging capacity refers to the amount of sulfides that can be neutralized by the reaction between the sulphides and the scavenger to produce bound sulphides. The scavenging capacity is a measure of mass per unit volume of sulphides. As used cls denotes lime to calcium hydroxide

As used here, the term as denotes the sweeping capacity (Je Lal) with sulphides in the drilling mud. Embodiments of the invention may include a method for neutralizing hydrogen sulfide in contaminated drilling mud at a surface during the drilling process. During cin drilling, drilling mud can be injected into sil hole to help the drill bit to drill the hole. Drilling mud can become sulfide contaminated

5 hydrogen that is released from the formation. Referring to Figure 1; A method for neutralizing hydrogen sulfide in a well bore during drilling operations is presented. The configuration and associated method are described for both types of operation in starting mode and steady state mode. unless otherwise indicated; The operating mode is steady state operations.

0 pH buffer solution can be mixed with drilling mud in rig tank 0. Rig tank 100 can be any container suitable for preparing ba and aly to carry drilling mud as source for drilling operations . in at least one form; The platform tank (ial) 100 is an open tank. in at least one form; The drilling rig reservoir

The rig tank 100 is a conventional rig tank and can include other machinery and mechanical tools such as shakers. The rig pump 115 can be used to pump and circulate drilling mud from the rig tank Mg tank 100 to the rig 135 or wethole 145.

during the starting position; The pH regulator solution is mixed with the drilling mud to increase the pH of the drilling mud to the target pH. during steady state operations; The pH buffer solution is mixed with the drilling mud to maintain the pH at the target pH. The target pH can be the same for both types of processes in starting mode and steady state. The target pH can be higher than

10; alternatively higher than 10.5; Alternatively, between 10.5 and 1 1 hydrogen sulfide can be dissolved in drilling mud. The solubility of hydrogen sulfide in drilling mud is inversely proportional to the pH. usefully; At a pH above 0, hydrogen sulfide dissolves in the drilling mud and remains in solution. Hydrogen sulfide can produce sulfide ions (ALE) to dissolve in the drilling mud. without adhering to a specific theory; be of

5 Concept Molecular hydrogen sulfide (H2S) can be interchanged between a gas phase and a liquid phase depending on the pH of the fluid it carries. at a high pH; For example, a pH greater than 10,; Hydrogen sulfide can dissolve in the liquid phase and react with hydroxyl ions when dissolved; According to the following equation: OH- — HS- + H20 + 125.

0. The resulting disulfide ion (HS=) can remain in solution due to its negative charge. Corrosion problems are reduced by keeping the hydrogen sulfide in solution since there is no free hydrogen sulfide gas. In at least one embodiment of the present invention, the hydrogen sulfide may remain dissolved in the drilling mud by maintaining the pH at or above 0 1 5 throughout the entire system.

The steps of increasing the pH of the drilling mud with a pH buffer solution and allowing the hydrogen sulfide to dissolve in the drilling mud are not sufficient alone to scavenge the hydrogen sulfide in the absence of a scavenger; A drop in pH below 10 can result in the release of hydrogen sulfide gas from solution in the drilling mud.

The dissolved hydrogen sulfide can lower the pH of the drilling mud. in at least one form; An indication of the presence of hydrogen sulfide in the return flow line 150 can be determined based on the amount of pH that is mixed in the rig tank 100. The pH buffer can be selected from a combination of caustic soda

0, lime and monoethanolamine; and combinations thereof. usefully; Unlike caustic soda, lime can precipitate carbonates, which can form in the presence of carbon dioxide. The amount of pH buffer to be added in the (ha) rig tank 100 is determined by the need to adjust or maintain the pH of the drilling mud. The pH of the drilling mud can be measured by a pH meter in the tank

5 105. The tank pH meter 105 can be any instrument capable of measuring the pH of the drilling mud in the rig tank 100. In the alg model at least” the tank pH meter is Any tool for measuring pH. The 105 Reservoir pH Meter offers a means of monitoring the pH of drilling mud over time. in at least one embodiment of the present invention; The number is measured

0 pH of the drilling mud at a reservoir pH meter of 105 every 30 minutes using a pen-type pH meter. Adjustments can be made to the amount of pH buffer that is mixed in the rig tank 100 based on the pH measured by the pH meter in the tank 105.

during the starting position; After the pH of the drilling mud increases to the target pH; Scavenger is added to the rig tank 100 to produce a scavenger-containing drilling mud. in at least one form; The pH of the drilling mud is maintained at the target pH so that Jolin can scavenge with dissolved sulfide ions. in at least one form; The drilling mud can be circulated at the target pH through the rig 135 and the wellbore 145 while the scavenger is added to the rig tank 100. The scavenger can be any chemical compound that reacts irreversibly with hydrogen sulfide in at least one form; The scavenger can be a liquid based triazine. in at least one form; Sle-0 liquid-based triazine is triethanol (hexahydro-1 »3 5¢—-triazine-1 +3:5-triyl) marketed under the trade name Mil-Gard® XPR by Baker Hughes ® in one embodiment on “JN” is Ble's liquid-based triazine based on hydroxyl alkyltriazine marketed under the trade name Safe-Scav HS by Swaco Inc. 1-a/a. The scavenger reacts with ions dissolved sulfides in the drilling mud in an irreversible reaction to produce a 5_-bound sulfide. in at least one form; The bound sulfide remains in solution even when the pH of the drilling mud drops below 10. The bound sulfide is soluble in the drilling mud regardless of the pH. in at least one form; The bound sulfide cannot be separated from the drilling mud. in at least one form; When the scavenger is triethanol (hexahydro-1+3 56-triazine-1+3 »5-triyl); The bound sulfur is a triathine, and 0 is produced according to the following equation: et 0 sg z a in LS ws WT ms win WNW 8 l: wsh 8 sisis 1 i Trithians {nasl alum f Pour R + + + Tias M EE

in at least one embodiment of the present invention; More scavenging is added to the reservoir of rig 0. More scavenging may be added than the expected scavenging capacity required. In at least one embodiment, the amount of scavenger to be added can be determined by considering the disequilibrium pressure exerted by the mud column on the formation and the concentration of hydrogen sulfide present in the formation. As used herein the term "losing pressure" refers to when the pressure exerted by the drilling fluid on the formation is greater than the formation pressure; The difference is referred to as the loss of equilibrium pressure. in at least one form; The scavenging capacity of the scavenging amount is in excess of the scavenging power required to convert all of the bound hydrogen sulfide. in at least one embodiment of the present invention; The scavenging volume is greater than 11.38 kg/m3 (4 lb/m3) or alternatively greater than 14.26 kg/m3 (5 lb/barrel); Alternatively less than 17.11 kg/m3 (6 lb/dias) and alternatively between 8 kg/m3 (4 lb/bbl) 5 17.11 kg/m3 (6 lb/bbl). The amount of scavenger added to the rig 100 reservoir ranging from 11.38 kg/m³ (4 lb/bbl) to 17.11 kg/m³ (6 lb/lb) provides a scavenging capacity of between 800 mg/L and 1200 mg/L H2S In drilling mud containing scavenger. in at least one form; The scavenging amount is greater than the measured lan concentration. Scavenging amount can be tested at rig tank 100. ol] steady state operations; The scavenging capacity of the scavenger drilling mud can be determined using the Gas Train tool (GGT 62101611). The die of 0 scavenger drilling mud can be obtained from supply line 120. The sample is mixed with a known amount of sulphide to produce Known sulfide concentration The known sulfide concentration is in excess of the expected scavenging power such that the known sulfide reacts with a fraction of the scavenger in the sample Any residual sulfides from the known sulfide are measured using the GGT instrument to determine the measured sulfide concentration. The 661 instrument measures dissolved sulphides in the sample to determine the measured sulphide concentration.5 The scavenging capacity of a scavenger-containing drilling mud is determined on the basis of the following equation:

— 1 1 —

Scavenging capacity - (known sulfide concentration) — (measured sulfide concentration). as an example; A sample of scavenger-containing drilling mud is mixed with a known amount of sulfide so that the known sulfide concentration is 1500 mg/L. The GGT instrument is then run to determine that the measured sulphide concentration is TOO mg/L. So the scavenging capacity is 800 mg/L

(1500 mg/L - 700 mg/L = 800 mg/L). to measure the scavenging capacity of the reflux mud; It is assumed that some of the soluble sulfur peptides were scavenged. die is obtained from reverted clay. A known volume of sulphides is mixed with die from the reflux slurry to achieve a known sulphide concentration of 1500 mg/L in the reflux slurry sample. The GGT instrument is then run to determine that the measured sulphide concentration is 1200 mg/L. The scavenging capacity of the reflux slurry sample was 300 mg/L (1 500 mg/L -

0 1200 mg/L = 300 mg/L). during steady state operations; The amount of scavenging to be added to the rig reservoir 100 is determined on the basis of the slurry scavenging capacity of the reflux line 150. The scavenging capacity may be determined on the basis of a sample obtained from the rig 150. In at least one embodiment; Scavenging capacity is determined using the Garrett Gas Train (GGT) instrument as 5 described. If the GGT measures a identifiable amount of dissolved sulphides as ele sulphides concentration this indicates scavenger depletion in the reflux mud. If depletion is indicated scavenging, then an amount of scavenging can be added to the reservoir of rig 1 00 which is determined by the scavenging capacity and the measured sulphides.In at least one embodiment, if the scavenging capacity in the return mud in the return flow line 150 measured at dad is less than the scavenging capacity in Drilling mud containing at least; an amount of scavenging is added to the rig tank 100 based on the reflux mud sample measurements obtained from the reflux line 150. In one embodiment on (JY) the scavenging capacity is measured twice per day In at least one embodiment the scavenging capacity shall be measured as necessary to confirm the scavenging capacity.

during the starting position; After the target pH aig is achieved the foam scavenging capacity is achieved;

The drilling mud containing scavenger is allowed to flow out of the rig tank 100 mm

Through the inlet of the pump 110 to the rig pump 115. The rig 135 creates a hole

145 in formation 140. Drilling mud (ginal) on a sweeper which is pumped through a rig 135 5 Acts as drilling mud to maintain pressure in the blast hole 145 and to remove drilling exfoliants while working

Excavator 135. Additionally; The amount of scavenger in scavenging-containing drilling mud reacts with

Hydrogen sulfide, which is mixed with scavenger-containing drilling mud. in

at least one model; Hydrogen sulfide is released from the formation.

The reaction between the scavenger and hydrogen sulfide can occur at any point in the

0 system provided that the pH is maintained between 10,5 and 11. The reaction can occur at the bottom of the jill hole 145 (in the annulus 142), in the backflow line 150 and in the rig tank 100. After the reaction has occurred, the scavenger-containing drilling mud also contains bound sulfides.

After Exit 135; Drilling mud containing sweeper travels up the 142nd loop and enters

5 Return flow line 150 as return mud. Return mud flows into rig tank 9 tank 100 where further pH buffer and scavenger solution may be added as required or as determined by sample measurements obtained from backflow line 150 after mud flow back at constant rate; Steady-state processes are entered.

0 A method is presented for the neutralization of hydrogen sulfide in contaminated mud at the surface of a drilling site. Contaminated slurry is fed from the Ad pit to a treatment loop where a pH buffer solution is added to produce a higher pH slurry at the target pH. Once the target pH is reached; Scavenger is added to the high pH slurry to produce a cured slurry. The amount of scavenger added depends on the measured sulphide concentration in the high-number clay

— 3 1 — pH. The processed slurry is fed to at least one stirrer tank where the stirrers and circulation pump create turbulence in the stirred tanks. The disorder enhances the reaction between the scavenger and the dissolved sulfides to produce a bound sulfide. The reaction is enhanced because the turbulence makes for better mixing; Which increases the reaction between the sulfides and the scavenger. A die point scavenger may be used in stirred tanks to obtain a sample for measuring the measured sulfide concentration when it is below an acceptable limit; The treated mud exits the stirred tanks as clean mud and flows into the rig tank to be used in the rig with the rig. A method for hydrogen sulfide neutralization that provides a controlled environment for hydrogen sulfide neutralization. 0 1 Referring to Fig. 2 ¢ shows a system for neutralizing ApS hydrogen in contaminated mud at the surface of the drill site during drilling operations. A method for neutralizing hydrogen sulphide in contaminated mud at a surface during drilling operations is described with reference to Fig. 2. Drilling mud is supplied to rig 135 from the rig tank 100. The hydrogen sulphide in the rig tank 145 of formation 140 is carried by Drilling mud to produce polluted mud. 5" slurry slurry am pn hydrogen sulfide is fed to the curing loop 200 through the process line 250. The curing dala 200 includes a buffer solution injection point 202; a sample point 04 and a sweeping grinding point 206. The curing loop 200 is designed to allow with a retention time in the 200 process loop of between one and three minutes' or alternatively less than five minutes.As used herein the term 'danas' refers to the pipe diameter ¢, length and configuration so that 0 is the desired gauge. In one embodiment on the (JV) the machining loop 200 is secured by support sleds (not shown). The buffer injection point 202 can be any type of port capable of allowing the pH buffer to enter the process loop 200. The buffer injection point 202 can include a reservoir (not shown) containing the prepared pH buffer

to inject » alternatively; The buffer injection point 202 can be connected to the pH buffer source by means of pipes. The pH buffer is injected into the contaminated slurry at buffer injection point 202 to produce a higher pH slurry. Sample point 204 can be any type of port capable of allowing a sample to be pulled from a processing loop 200. In at least one sample; The sample point can include 204 gauges to allow real-time measurement of high pH slurries. in at least one form; The sample point includes 204 pH scales. At sample point 204 the pH of the high pH slurry is measured. if the pH is below the target pH; An additional pH buffer solution is injected at the injection point of 0 buffer solution 202. If an additional pH buffer solution is injected; A second pH measurement is taken at sample point 204 to determine the pH of the high pH slurry. The cycle of injecting additional buffer pH at buffer injection point 2 and measuring the pH at sample point 204 can continue until the target pH is reached. As described above with reference to Figure 1; when (high pH 5 clay) reaches the target pH; Hydrogen sulfide, hydrogen 6, can dissolve in the solution in high pH clays. The concentration of sulphides measured from the sample obtained can be measured from sample point 204. The scavenger injection point 206 can be any type of port capable of allowing the scavenger to enter the processing loop 200. The scavenger injection point 206 can include a reservoir (not shown) 0 contains the “injectable scavenger” alternatively; The scavenging injection point 206 can be connected to the scavenging source by means of pipes. at the point of scavenger injection 206; An amount of scavenger is injected into the high pH slurry to produce cured slurry. The processed slurry exits the processing loop 200 and flows into the stirred tank 220 through the slurry line treated 210. The stirred tank 220 can include one or more tanks. Every 5 Stirrer 220 tank includes at least one Stirrer 225. The treated slurry flows into the stirred tank 220

— 5 1 — where stirrers 225 create turbulence in the stirred tank 220. Turbulence increases from mixing of the scavenger into the processed slurry; This enhances the reaction between the scavenger and the hydrogen sulfide to produce bound sulfides. In one embodiment on (BY) a circulation pump 230 may be connected to an agitated tank 220 for further scavenger mixing in the stirred tanks 225. The treated slurry is fed to a circulation pump

0 by drawing pump 232. The treated slurry is returned to the agitated tank 220 through a mixing hopper (not shown) and through the outlet of pump 234. As shown in Figure 2 Laie two or more tanks are used which can use valves (indicated by symbol 1/ in a circle) to direct the flow around the circulation pump 230 and agitation tanks 220. The flow rate through

0 220 circulation pump at ill hole size and cleaning rate as defined by best practices. A sample point for buffer solution 222 can be any type of instrument capable of measuring the pH of a fluid. if the pH; As measured at a sample point

5 Buffer 222) is lower than the target pH, then an additional pH buffer can be added at the point of injection of buffer 202. The scavenger sample point 4 can be any type of port that allows a sample to be obtained from the stirred tank 220. In Model 220 At least one; sample obtained from the scavenge sample point 224 can be analyzed in the GGT instrument to measure the measured sulphide concentration and to determine the scavenging capacity of the fluid in the stirrer tank 220.

advantageously ‘ introduces the use of stirred tanks; agitators ' and circulating pump sufficient reaction time for the scavenger to neutralize the hydrogen sulfide When the measured sulphide concentration is less than 10 mg/l or less than the allowable amount based on local regulations, then the treated slurry comes out as clean slurry through a slurry line

— 6 1 — Clean 240 and flow into rig tank 100 where it can be used with rig 130 and rig 135. The system for hydrogen sulfide neutralization at a drilling site may also include flowmeters; pressure sensors and other useful tools for monitoring a process usefully; The system can provide a hydrogen sulfide neutralization system for continuous scavenging of hydrogen sulfide without having to stop drilling due to the risk of useful hydrogen sulfide release; The system offers complete control over the scavenging capacity of the drilling mud due to the continuous measurement of the measured sulphide concentration in the drilling mud. Although the invention (Jad) has been described in detail; However, it should be understood that many changes, substitutions and modifications can be made without deviating from the fase and the scope of the invention. Accordingly, the scope of the invention (Jad) shall be limited by the following claims and their appropriate legal equivalents. The singular forms “a” “the” include plural references unless the context clearly states otherwise. 5 The term lid) or optional means that the following described condition or event may or may not occur. Description Cases where the event or condition occurs and cases where it does not. The ranges here may be expressed as being of about one specified value; and/or to about another specified value. When such a range is expressed, it should be understood that the AT model from the one limiting value and/or to the other limiting value, together with all combinations within said range 0. As used herein dg appended claims; the words 'include' mean; 'Have' 'includes' and all grammatical variations thereof have an open, unrestricted meaning that does not exclude additional elements or steps.

— 7 1 — as used here The terms Jie “first” and “second” are randomly assigned and are only intended to distinguish two or more components of an equipment. It should be understood that the words “Jl and sec” do not serve any purpose AT and are not part of the name or description of the cle component and do not necessarily define a relative position or location of the component. Furthermore, it should be understood that the only use of the term "First" and "Second" does not require that there be any "Third" component although this possibility is envisaged within the scope of the present invention.

Claims (1)

protection elements 1- A method for neutralize hydrogen sulfide in a blister pit wellbore during drilling operations The method includes the following steps: Mixing an amount of abrasive in the drilling mud in the Laid rig tank to produce a drilling mud containing a scavenger such that the drilling mud containing a scavenger has a scavenging capacity; where the drilling mud is at the required pH; Where the drilling mud is mud water drilling Introducing drilling mud containing scavenging into the wellbore during drilling operations The drilling mud containing scavenger is workable with drill bit for Sia drilling. Blistering is where the amount of scavenger in the drilling mud containing the scavenger is capable of reacting in an inappropriate way 0 is reversed with the hydrogen sulfide present in the scavenger-containing drilling mud to produce scavenged hydrogen sulfide; determination of the scavenging capacity of a return mud; Where the return mud from the drill bit flows into the wellbore the following steps are involved: collecting a sample of the return mud from the return mud flow line; 5 Mixing a known amount of sulfides in the sample to obtain a known concentration of sulfides in the sample; Where the known amount of sulfide reacts with a part of the scavenger in the sample to leave a residual amount of sulfides «Measuring the remaining amount of sulfides in the sample using the Garrett Gas Train tool to obtain a measured concentration of clan Sl where The scavenging ability is the sulfide concentration 0 known minus die the concentration of sulfides measured; add additional scavenger to rig tank 19 when the scavenging capacity of the return mud is less than the spent scavenger level; Where the spent scavenger level appears when the measured sulfides concentration indicates a detectable amount of soluble sulfides. — 1 9 — 2- The method according to claim (1) also includes the step of adding a pH buffer solution to the drilling mud before the step of mixing a quantity of abrasive into drilling mud such that the required pH of the Excavation containing sweep between 10.5 and 11.0. 3- The method according to claim (1); The scavenger is more than 1.8 kg/barrel. 4- Method by claim (1(¢) wherein the scavenging capacity 508760961 is between 800 mg/L 0 and 1200 mg/L. 5- Method By claim (1); also includes the following steps: pH monitoring 5 for scavenger-containing drilling mud; and adding an additional pH buffer solution to the 5-containing scavenging drilling mud to maintain the required pH between 10.5 and 11. 6- The method according to claim (5)” where the number is monitored pH every 30 minutes 7- Method by claim (oS) where the pH is monitored using a Pen Type 0 pH monitor 8- Method by claim (1)” where is The scavenger is triazine d m ot he de v ¥ 3 ha i 8 4 3 8 mi i ahem a £2 3 l 1 l 3 8 8 lee Rend B i AEE 8 “mag 8 Bg ET a Nem RR 1 0: Alib > TE Me A Gen 2 8 3 L Sa T 3 bY 8 N A L OR 8 8 3 & B ye ane 3 Ltm Se mm x & TN ER 3 m % of ARE eR eR 6 1 8 8 5 #3 § : x Tae EN 65 0: ry 8 ne 6 ER X ¥ —_—— Agag Agag mm ng a. of a a a a TN oo NY: t l t l t l a l a a walking neighborhood DE a a 0 NT ey l a a a b TR ROS EN SS 5 L 13 L EN 8 L 2 Fa % the EY BF LA AA . be a ms & b NAS BS BS Be iy F ES % 3 8 ? nn 8 : TY 9 = Rx iY FE 3 X 8 for SNM EX BOER un £3 from ANNA NAAN OF R a Lt VEY AA ER is the EY, BFR mm ov SERN any, deg § > Ea RS ERS of 3 a a EY BCE R ¢ ? 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Fo hd 1 Figure? The Saudi Authority for Intellectual Property Sweden Authority for Intellectual Property pW RE .¥ + \ A 0 § Um 5 + < Ne ge “Benaj > Aye Ki Jada Li Days TEE Bbha Nase eg + Ed - 2 - 3 .++ .* provided that the annual financial fee is paid for the patent and that it is not null and void due to its violation of any of the provisions of the patent system, layout designs of integrated circuits, plant varieties and industrial designs or its implementing regulations. »> Issued by + BB 0.B Saudi Authority for Intellectual Property > > > “+ PO Box 1011 .| for ria 1*1 uo ; Kingdom | Arabic | For Saudi Arabia, SAIP@SAIP.GOV.SA